The Billing Code applies to domestic customers and sets voluntary standards to go over and above the supplier standard licence conditions. Participating energy suppliers are judged against five key commitment areas: switching, meter reading, energy bills and statements, payments, and back-billing.
British Gas and EDF Energy obtained gold awards from the code, meaning they are “fully compliant with all areas”, while Eon and Scottish Power received silver.
The results also showed that, in the majority of cases, suppliers are able to bill customers properly, and auditors found many areas of good practice within meter-reading and back billing.
Energy UK chief executive Lawrence Slade said: “The latest audit results are testament to the work suppliers are doing to improve the standard of service for their customers.
“Energy suppliers are striving for improved conversations with their customers. It is important for customers to check their bills and to get in touch with their supplier if they have any questions.”
Suppliers who achieved the highest rating this year have also seen a reduction in billing complaints.